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Computational Fluid Dynamics (CFD) has helped develop some of the latest aircrafts, help us
work more efficiently by maintaining our environment at a specific temperature, or help chill
beer for the superbowl !!!
Floworks takes a goal based approach to help us make these complex calculations. Floworks initially considers any steady state flow problem as a time-dependent problem. The solver
module iterates on an internally determined time step to seek a steady state flow field.
Floworks has an algorithm to stop these calculations once convergence has been achieved.
It is better a user uses his own criteria to determine where the solution should be stopped.
User specifies Goals as physical parameters of interest, so their convergence can be
considered as obtaining a steady state solution from engineering viewpoint.
Specifying Goals not only prevents possible errors in calculated values of these parameters,
but in most cases allows user to shorten the total solution time. Users can monitor Goal convergence behavior during calculations. They can then decide to stop the solver if solution is diverging or if necessary goals have been achieved. Goal progress bar is a qualitative and quantitative characteristic of the goal convergence process. For each goal user can choose to
use the goal for convergence control or not. Goals that are not used convergence control will
not influence finishing the calculation.
Users can specify the following types of Goals
Global Goal is a parameter calculated within the entire computational domain.
Point Goal is a parameter calculated at a user specified point.
Surface Goal is a parameter calculated on a user specified face of the model.
Volume Goal is a parameter calculated within a user specified space inside computational
domain, either in fluid or solid.
Equation Goal is a mathematical function defined using specified goals (either Global, Point, Surface, Volume) to monitor key parameters that Floworks does not calculate by default. They
play an important role in the overall calculation as values important to the engineer. Eg.
Efficiency of fan, co-efficient of drag / lift, Pressure gradients at a location.
It is recommended to specify appropriate goal with the specified condition. Eg: If user specify a pressure opening it makes sense to define a mass flow rate surface goal at this opening.
Floworks allows you to associate a type of condition (boundary condition, fan, heat source or radiative surface) with goals, which will be automatically created with the condition if the
“create associated goals” check box is selected in the conditions dialog box.
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